Dowsil 3145 RTV MIL-A-46146 Silicone Adhesive Sealant — Gray, 90ml Tube

Dowsil 3145 RTV MIL-A-46146 Silicone Adhesive Sealant — Gray, 90ml Tube

What Is Dowsil 3145 RTV MIL-A-46146 Silicone Adhesive Sealant?

Dowsil 3145 RTV MIL-A-46146 Adhesive/Sealant — also known as Dowsil 3145 RTV, MIL-A-46146 silicone adhesive sealant, or one-part RTV silicone sealant — is a premium one-part, room temperature vulcanising (RTV) polydimethylsiloxane (PDMS) silicone adhesive and sealant by Dow, specifically engineered for the sealing, bonding, and mechanical stabilisation of electronic components and assemblies in aerospace, defence, military, and industrial applications. Unlike two-part silicone systems requiring on-site mixing, Dowsil 3145 RTV cures at room temperature through moisture in the air — requiring no mixing, no ovens, and no special curing equipment — making it one of the most process-friendly MIL spec silicone adhesives available for electronics assembly and maintenance operations.

Qualified to MIL-A-46146 Group II/III, TY I, Dowsil 3145 RTV delivers a combination of high tensile strength (1035 psi / 7.1 MPa), exceptional elongation (670%), and enhanced thermal stability across a service temperature range of -45°C to +200°C — making it the preferred electronic component silicone adhesive for sealing module and housing openings, stabilising components on printed wiring boards (PWBs), sealing wired and electrical leads, and yoke assembly in systems subject to thermal cycling, vibration, and mechanical stress. The non-flowing gray formulation stays precisely in place after application, provides unprimed adhesion to glass, ceramics, reactive metals, and nylon, and can be further accelerated through mild heat below 60°C for faster production throughput. Available in a 90ml tube and a 310ml cartridge, Dowsil 3145 RTV is the MIL spec silicone sealant trusted by electronics manufacturers, MRO facilities, and defence contractors across the UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain. Maisam Trading LLC is the authorised Dowsil supplier in Dubai with stock available for prompt delivery across the entire GCC region.

Description

Dowsil 3145 RTV MIL-A-46146 Adhesive/Sealant is the benchmark one-part RTV silicone adhesive for military-specification electronics sealing and bonding applications, available from Maisam Trading LLC Dubai. This gray, non-flowing silicone adhesive cures through atmospheric moisture in an environment of 30 to 80 percent relative humidity — achieving a tack-free surface in 78 minutes at 25°C, and greater than 90% of full physical properties within 24 to 72 hours depending on section thickness and ambient conditions. For production environments requiring faster throughput, optional mild heat acceleration below 60°C can significantly reduce handling times to as little as 10 to 120 minutes. Note that this product cures from the exposed surface inward at approximately 0.25 inch per seven days — it is not suitable for highly confined spaces or deep section cure applications.

The cured silicone elastomer retains its original physical and electrical properties across a broad temperature range from -45°C to +200°C, with thermal cycling capability to -55°C possible where verified for specific assembly configurations. The 670% elongation ensures the cured sealant absorbs differential thermal expansion between bonded substrates without cracking or delamination, while the 1035 psi tensile strength provides robust mechanical performance for component stabilisation applications. Primerless adhesion is achieved on glass, ceramics, reactive metals, and selected laminates, resins, and plastics — though substrates such as Teflon, polyethylene, polypropylene, and non-reactive metals may require primer or surface treatment to achieve adhesion. All surfaces should be thoroughly cleaned and degreased prior to application using appropriate solvents — solvents such as DOWSIL OS Fluids, naphtha, mineral spirits, or MEK are recommended; IPA and acetone alone do not effectively remove oils. As a trusted buy Dowsil 3145 UAE and GCC source, Maisam Trading LLC supplies this product in 90ml tube and 310ml cartridge formats for prompt delivery across Dubai, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain. This product is not for medical or pharmaceutical uses.

Features & Benefits

• One-part system — no mixing required, no ovens needed
• Room temperature moisture cure — operates at 30–80% relative humidity
• Non-flowing — stays precisely in place after application
• High tensile strength — 1035 psi (7.1 MPa)
• Exceptional elongation — 670%
• Enhanced thermal stability — suitable for high temperature applications
• Qualified to MIL-A-46146 Group II/III, TY I
• Primerless adhesion to glass, ceramics, reactive metals, and nylon
• Tack-free in 78 minutes at 25°C
• Optional heat acceleration below 60°C for faster throughput
• Operating temperature range: -45°C to +200°C
• Alkoxy / condensation / methoxy cure chemistry
• Available in 90ml tube and 310ml cartridge

Applications

• Sealing openings in modules and housings
• Adding mechanical stability to individual electronic components
• Assembly and bonding of components on printed wiring boards (PWBs)
• Sealing in and around wired and electrical leads
• Yoke assembly
• Electronics encapsulation and protection in aerospace and defence equipment

Industries Served

• Aerospace & Defence
• Military Electronics & MIL Spec Applications
• Aviation MRO
• Consumer & Industrial Electronics Manufacturing
• Telecommunications & Data Communications
• Oil & Gas Instrumentation

Why Buy from MAISAM TRADING LLC?

• 18+ years of experience supplying Dowsil and Dow silicone products across the GCC
• Available in 90ml tube and 310ml cartridge
• Dedicated B2B support and technical guidance
• Prompt delivery and export solutions across UAE, Saudi Arabia, Qatar, Oman, Kuwait & Bahrain
• Verified stock of original Dowsil (Dow) products
• Call: +971521672252 | Email: sales@maisamdubai.com

Technical Specifications

FAQs

Q1: What is Dowsil 3145 RTV used for?
Dowsil 3145 RTV MIL-A-46146 is a one-part silicone adhesive sealant used for sealing module and housing openings, stabilising electronic components on printed wiring boards, sealing wired and electrical leads, yoke assembly, and general electronics encapsulation in aerospace, defence, and industrial applications. It is not for medical or pharmaceutical use.

Q2: Does Dowsil 3145 RTV require mixing?
No. It is a one-part system — simply dispense and apply. No mixing, no measuring, and no curing ovens are required. It cures at room temperature through moisture in the air.

Q3: How long does Dowsil 3145 RTV take to cure?
It is tack-free in approximately 78 minutes at 25°C. Greater than 90% of full physical properties are achieved within 24 to 72 hours at 30–80% relative humidity. Optional mild heat below 60°C can accelerate handling times to as little as 10 to 120 minutes.

Q4: What is the service temperature range?
For most uses, the cured silicone elastomer operates reliably from -45°C to +200°C. Thermal cycling to -55°C may be possible but should be verified for specific assemblies and configurations.

Q5: What is Dowsil 3145 RTV qualified to?
It is qualified to MIL-A-46146 Group II/III, TY I — a US military specification for silicone adhesive sealants used in electronics and defence applications.

Q6: What substrates does Dowsil 3145 RTV bond to without primer?
It provides unprimed adhesion to glass, nylon 6/6, reactive metals, ceramics, and selected laminates and resins. Non-reactive substrates such as Teflon, polyethylene, polypropylene, and non-reactive metals may require primer or surface treatment. All surfaces should be thoroughly cleaned and degreased before application.

Q7: Is Dowsil 3145 RTV suitable for deep section or confined space applications?
No. The product cures from the exposed surface inward at approximately 0.25 inch per seven days and is not suitable for highly confined spaces or applications requiring deep section cure.

Q8: What pack sizes are available?
Dowsil 3145 RTV is available in a 90ml tube and a 310ml cartridge. Contact Maisam Trading LLC for availability of larger packing options.

Q9: Where can I buy Dowsil 3145 RTV in the UAE or GCC?
Maisam Trading LLC is a trusted Dowsil supplier in Dubai. Contact +971521672252 or email sales@maisamdubai.com. We supply across UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.

Q10: Is bulk purchasing available?
Yes. Maisam Trading LLC offers competitive pricing for bulk and B2B orders across the GCC. Contact our sales team for a customised quote.

Availability & Support

Dowsil 3145 RTV MIL-A-46146 Silicone Adhesive Sealant Gray is available across Dubai and all major GCC aerospace, defence, electronics, and industrial supply networks through Maisam Trading LLC.

• Call / WhatsApp: +971521672252
• Email: sales@maisamdubai.com for quotes, TDS, SDS, or bulk order pricing